您的位置: 首页 > 作业答案 > 其他 > I don't know when Mr.Li ____ back.But I'll call you at once when he ___ backa.will come; will come b.comes; comesc.come; will come d.will come; comes为什么选D

I don't know when Mr.Li __ back.But I'll call you at once when he _ backa.will come; will come b.comes; comesc.come; will come d.will come; comes为什么选D

分类: 作业答案 • 2022-01-02 15:22:41

问题描述：

I don't know when Mr.Li ____ back.But I'll call you at once when he ___ back
a.will come; will come b.comes; comes
c.come; will come d.will come; comes
为什么选D

答

因为是一般将来式啊！表示将要怎么样，后半句有I‘ll了所以后面用第三人称单数

答

因为主句用一般现在时,从句选择相应的时态.这句说明他还没有回来,所以该用将来时.但是象ONCE,AS SOON AS 之类的引导的从句要用一般现在时态表将来.

答

因为他还没回来，所以前面一句用一般将来时，will come
后一句是用一般现在时表示将来的动作，用comes

I don't know when Mr.Li ____ back.But I'll call you at once when he ___ backa.will come; will come b.comes; comesc.come; will come d.will come; comes为什么选D

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I don't know when Mr.Li __ back.But I'll call you at once when he _ backa.will come; will come b.comes; comesc.come; will come d.will come; comes为什么选D